1.
[tex]4y+4=7x \\
\underline{36-4y=3x} \\
4y+4+36-4y=7x+3x \\
40=10x \\
x=4 \\ \\
4y+4=7x \\
4y+4=7 \times 4 \\
4y+4=28 \\
4y=24 \\
y=6 \\ \\
x=4 \\
y=6[/tex]
2.
[tex]3x-10y-29=0 \\
-11x-10y+13=0 \ \ \ |\times (-1) \\ \\
3x-10y-29=0 \\
\underline{11x+10y-13=0} \\
3x-10y-29+11x+10y-13=0 \\
14x-42=0 \\
14x=42 \\
x=3 \\ \\
3x-10y-29=0 \\
3 \times 3 -10y-29=0 \\
9-10y-29=0 \\
-10y-20=0 \\
-10y=20 \\
y=-2 \\ \\ x=3 \\ y=-2[/tex]
