The parameter $mm$ is the slope of the straight line. The parameter $tt$ is the $yy$-axis intercept.

Line g:

$y=m_{g}x+t_{g}y=m\_gx+t\_g$

The line $gg$ has the gradient $-\frac{3}{2}-\backslash frac\{3\}\{2\}$, which means $m_g=-\frac{3}{2}m\_g\; =\; -\backslash frac\{3\}\{2\}$.

$y=-\frac{3}{2}x+t_{g}y=-\backslash frac\{3\}\{2\}x+t\_g$

It intersects the $yy$-axis at $\frac{9}{2}\backslash frac\{9\}\{2\}$, which means $t_g=\frac{9}{2}t\_g\; =\; \backslash frac\{9\}\{2\}$.

$y=-\frac{3}{2}x+\frac{9}{2}y\; =\; -\backslash frac\{3\}\{2\}x\; +\; \backslash frac\{9\}\{2\}$

Line h:

$y=m_{h}x+t_{h}y=m\_hx+t\_h$

The line $hh$ has the gradient $22$, which means $m_h=2m\_h=2$

$y=2x+t_{h}y=2x+t\_h$

It intersects the $yy$-axis at $11$, which means $t_h=1t\_h\; =\; 1$.

$y=2x+1y\; =\; 2x\; +\; 1$